When an incinerator goes out suddenly, theosupply should be shut off quickly A.fuelB.sludgeC.airD.fuel and sludge

题目内容（请给出正确答案）

When an incinerator goes out suddenly, theosupply should be shut off quickly

A.fuel

B.sludge

C.air

D.fuel and sludge

参考答案

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